Unfortunately I don’t think its quite that straight forward. Not all SMPS are crap.
One of the reasons I try to avoid them is that they feed noise back into the mains. This may be important if for example you have a dedicated mains supply.
Some equipment can cope very well with any noise they deliver.
I’m not SB user, but people here who use them seem to recommend a linear supply writing it makes an audible difference. There is quite a bit on this site regarding linear supplies for the SB so a bit of a search may prove fruitful.